Structural multi-element model of viscoelastic material: concept and experimental testing

The object of research. The paper presents the results of experimental studies and mathematical modeling of stress formation in thermoplastic polymer (vinyl plastic) under cyclic thermomechanical loading. Stress accumulation occurs under cyclic thermomechanical loading in a pinched rod, similar effects are observed, for example, in thermoplastic elements subjected to joint mechanical loads and variable temperatures. Method. A multi-element structural mathematical model with memory for thermomechanical loading is proposed, which allows to consider the accumulation of residual thermal stresses. Results. The results of modeling and experiment are compared. According to the results, corrections in the approach to the application of this model have been made. Considering the corrections, good agreement with the results of experimental determination of stresses under complex cyclic thermomechanical loading is obtained. The ways of further development of the proposed approach are outlined.

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